Despite never holding office again, Ingersoll remained a prominent political figure as a result of his great oratorical skills. He always attracted large crowds and audiences. He was so skilled that he could lecture three to 4 hours straight, sometimes without drinking water. Before radio and television, more Americans heard him speak than any other person. Mark Twain considered him the greatest master of the English language he (Twain) had ever seen. Ingersoll died of congestive heart failure in 1899 in Dobbs Ferry, New York.